/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file and, per its terms, should not be removed:
 *
 * Copyright (c) 2004 World Wide Web Consortium,
 *
 * (Massachusetts Institute of Technology, European Research Consortium for
 * Informatics and Mathematics, Keio University). All Rights Reserved. This
 * work is distributed under the W3C(r) Software License [1] in the hope that
 * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
 */

package org.w3c.dom;

/**
 *  The <code>DOMImplementationList</code> interface provides the abstraction
 * of an ordered collection of DOM implementations, without defining or
 * constraining how this collection is implemented. The items in the
 * <code>DOMImplementationList</code> are accessible via an integral index,
 * starting from 0.
 * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407'>Document Object Model (DOM) Level 3 Core Specification</a>.
 * @since DOM Level 3
 */
public interface DOMImplementationList {
    /**
     *  Returns the <code>index</code>th item in the collection. If
     * <code>index</code> is greater than or equal to the number of
     * <code>DOMImplementation</code>s in the list, this returns
     * <code>null</code>.
     * @param index Index into the collection.
     * @return  The <code>DOMImplementation</code> at the <code>index</code>
     *   th position in the <code>DOMImplementationList</code>, or
     *   <code>null</code> if that is not a valid index.
     */
    public DOMImplementation item(int index);

    /**
     *  The number of <code>DOMImplementation</code>s in the list. The range
     * of valid child node indices is 0 to <code>length-1</code> inclusive.
     */
    public int getLength();

}